1. Let f(x)=ax^2+bx+c be a quadratic function where a≠0 .Which of the following statements is true about the relationship between the vertex of f(x) and the value of a?

Question

A. The vertex of f(x) is a minimum when a>0 . The vertex of is a maximum when a<0 .
B. The vertex of f(x) is a maximum when a>0 . The vertex of is a minimum when a<0 .
C. The vertex of f(x) is a minimum when a>0 or a<0
D. The vertex of f(x) is a maximum when a>0 or a<0

Answer 1

B. The vertex of f(x) is a maximum when a>0 . The vertex of is a minimum when a<0 .